Question

Amongst the following, which solution shows a Tyndall effect?

(a) Salt solution
(b) Milk
(c) $CuS{O}_4$ solution
(d) Starch solution

• A. (a) and (d)
• B. (c) and (d)
• C. (a) and (c)
• D. (b) and (d)

Answer 1

The correct option is D (b) and (d)

The Tyndall effect is the process in which the particles in a colloidal size scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions and some very fine suspensions. Therefore, it can be used to verify if a given solution is a colloid. The intensity of scattered light depends on the density of the colloidal particles as well as the frequency of the incident light.

Solutions that show the Tyndall effect are milk and starch solutions which can scatter the beam of light as they have particles of colloidal rage.

Hence option D is correct.